I heard masturbation makes it hard to get an erection in men if they do it daily.

is that true?

Quoting: Saratonin

it is all about supplementation and desensitization. You have to replace your minerals and vitamins. And you have to keep an active imagination. Masturbation gets old. Sex does too, that's why you have to be honest and open about what you like. If not, the wood will stop pecking...